Answer:
There was a girl half my age when I was 12, now I am 66, how old is she?
I pass before the sun but make no shadow. What am I?
What goes up and down but does not move?
What has a ring but no finger?
I tremble at each breath of air and yet can heaviest burdens bear.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.